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Canon Patent for EF-M 70-400mm f/4.5-7.2 STM Lens

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Egami has discovered a new patent filed by Canon. The new patent describes a EF-M 70-400mm f/4.5-7.2 STM lens which is designed for EOS-M mirrorless system cameras.

If the patent becomes live in production, it will be the first super-telephoto in the EOS-M system. This patent also a sign that the company still committed to the system.

The patent for the EF-M 70-400mm f/4.5-7.2 STM telephoto lens for APS-C mirrorless cameras can be seen below.

Canon EF-M 70-400mm f/4.5-7.2 STM Lens Patent


  • Patent Publication No. 2014-228734 (Google Translated)
    • Published 2014.12.8
    • Filing date 2013.5.23
  • Example 3
    • Zoom ratio 5.58
    • The focal length f = 69.59-251.52-388.00mm
    • Fno. 4.68-6.30-7.00
    • Half angle ω = 11.11-3.11-2.02 °
    • Image height 13.66mm
    • Overall length of the lens 155.01-227.97-240.02mm
    • BF 15.81-37.15-46.87mm
    • Inner focus

via Egami